Rastatt, Germany is, by most accounts, a place you wouldn’t be able to point on a map even if you’re life depended on it, but that doesn’t mean the town is a mere afterthought. On the contrary, it’s the home of German tuner ATT-TEC, a tuning company that specializes in wicked programs for BMWs.
Their latest project is for the BMW M3 E93 Convertible. Comprised of a complete aerodynamic and performance upgrade, ATT-TEC went to great lengths to give the M3 some serious looking edge. Aesthetically, the tuner gave the sports car a matte black wrapping foil to go with new carbon fiber components, particularly on the hood, the grille, mirrors, and side gills. Then, they fitted the M3 with a new set of 20" one-piece forged ADV.1 rims wrapped in 245/30R20 (front) and 295/20R20 (rear) Vredestein Ultrac Sessanta tires. Finally, ATT-TEC gave the car a KW Variant 3 inox-line coilover kit, which is adjustable for ride height, rebound, and damping.
Moving on to the engine, ATT-TEC fitted an SK I “Sporty Drive” supercharger system from G-Power to the M3’s 4.0-liter V8 engine, before reprogramming its ECU unit and adding a new stainless steel exhaust. The result of all the engine tweaking is a car that now carries an output of 520 horsepower, a 100-horsepower increase from the stock model’s 420-horsepower output.
As far as prices go, the aesthetic modifications cost €2,600 ($3,400) while the complete wheel-and-tire set hits €7,150 ($9,400) with the coil over kit costing €1,929 ($2,500). From there, the supercharger system will cost you €12,740 ($16,800) with the stainless steel exhaust setting you back another €1,595 ($2,100). Basically, customers are going to have to REALLY want to upgrade their M3 to dish out all of this cash.